package com.toyota.toyotaownerspoc.barcode;

/*

 * Copyright 2009 ZXing authors
 
 *
 
 * Licensed under the Apache License, Version 2.0 (the "License");
 
 * you may not use this file except in compliance with the License.
 
 * You may obtain a copy of the License at
 
 *
 
 *      http://www.apache.org/licenses/LICENSE-2.0
 
 *
 
 * Unless required by applicable law or agreed to in writing, software
 
 * distributed under the License is distributed on an "AS IS" BASIS,
 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 
 * See the License for the specific language governing permissions and
 
 * limitations under the License.
 
 */

 

 
import com.google.zxing.LuminanceSource;
 

 
import android.graphics.Bitmap;
 
import android.graphics.BitmapFactory;
 

 
import java.io.FileNotFoundException;
 

 
/**
 
 * This class is used to help decode images from files which arrive as RGB data from
 
 * Android bitmaps. It does not support cropping or rotation.
 
 *
 
 * @author dswitkin@google.com (Daniel Switkin)
 
 */
 
public final class RGBLuminanceSource extends LuminanceSource {
 

 
  private final byte[] luminances;
 

 
  public RGBLuminanceSource(String path) throws FileNotFoundException {
 
    this(loadBitmap(path));
 
  }
 

 
  public RGBLuminanceSource(Bitmap bitmap) {
 
    super(bitmap.getWidth(), bitmap.getHeight());
 

 
    int width = bitmap.getWidth();
 
    int height = bitmap.getHeight();
 
    int[] pixels = new int[width * height];
 
    bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
 

 
    // In order to measure pure decoding speed, we convert the entire image to a greyscale array
 
    // up front, which is the same as the Y channel of the YUVLuminanceSource in the real app.
 
    luminances = new byte[width * height];
 
    for (int y = 0; y < height; y++) {
 
      int offset = y * width;
 
      for (int x = 0; x < width; x++) {
 
        int pixel = pixels[offset + x];
 
        int r = (pixel >> 16) & 0xff;
 
        int g = (pixel >> 8) & 0xff;
 
        int b = pixel & 0xff;
 
        if (r == g && g == b) {
 
          // Image is already greyscale, so pick any channel.
 
          luminances[offset + x] = (byte) r;
 
        } else {
 
          // Calculate luminance cheaply, favoring green.
 
          luminances[offset + x] = (byte) ((r + g + g + b) >> 2);
 
        }
 
      }
 
    }
 
  }
 

 
  @Override
 
  public byte[] getRow(int y, byte[] row) {
 
    if (y < 0 || y >= getHeight()) {
 
      throw new IllegalArgumentException("Requested row is outside the image: " + y);
 
    }
 
    int width = getWidth();
 
    if (row == null || row.length < width) {
 
      row = new byte[width];
 
    }
 

 
    System.arraycopy(luminances, y * width, row, 0, width);
 
    return row;
 
  }
 

 
  // Since this class does not support cropping, the underlying byte array already contains
 
  // exactly what the caller is asking for, so give it to them without a copy.
 
  @Override
 
  public byte[] getMatrix() {
 
    return luminances;
 
  }
 

 
  private static Bitmap loadBitmap(String path) throws FileNotFoundException {
 
    Bitmap bitmap = BitmapFactory.decodeFile(path);
 
    if (bitmap == null) {
 
      throw new FileNotFoundException("Couldn't open " + path);
 
    }
 
    return bitmap;
 
  }
 

 
} 
